TWI425841B - Display device and color adjustment method thereof, and method for display video signal - Google Patents

Description

Display device, color adjustment method thereof and method for displaying video signal

The present invention relates to a color adjustment technique, and more particularly to a color adjustment technique for a display device.

With the advancement of technology, people are paying more and more attention to the picture quality of video images. The current color adjustment technology of display devices can be mainly divided into adjusting intensity (Intensity), hue (Hue) and saturation (Saturation). Due to the high color correlation between R, G, and B in the red, green, and blue (R, G, and B) color spaces, traditional techniques are often used to adjust color and brightness. Convert the RGB color space to the HSI color space, where H stands for Hue, S stands for Saturation, and I stands for Intensity. For example, the RGB color space is converted into the HSI color space by the following formulas (1) to (3): H=θ if B≦G, H=360-θ if B>G, where θ=

In view of the above, H, S, and I can be easily adjusted in the HSI color space. Then, you can adjust the H of each pixel in the picture. For example, H for each pixel is 30. It is also possible to adjust the S of each pixel in the picture, for example, 30 for each pixel. You can also adjust the I of each pixel in the picture. For example, each pixel I adds 30. In other words, the above method adjusts H, S or I for each pixel of the picture. However, not every pixel in the picture needs to be adjusted. Therefore, the above method causes a problem that the pixels that do not need to be adjusted have color or brightness distortion.

In view of the above, the prior art develops H, S or I which adjusts the pixels of the sub-pictures in the picture. However, the above method causes the color of the boundary of the sub-picture to be discontinuous.

The present invention provides a display device that adjusts the hue, saturation, or brightness of a pixel group having a specific range of hue to improve the quality of the picture.

The present invention provides a display device that counts the number of pixels of each color tone and adjusts the hue, saturation, or brightness of some or all of the pictures accordingly to enhance the appropriateness of the picture.

The invention provides a method for displaying a video signal, and adjusts the hue, saturation or brightness of a pixel group having a specific range of tones to make the color of the picture brighter.

The invention provides a method for displaying a video signal, and adjusting the color tone according to the number of pixels of each color tone to improve the quality of the picture.

The invention provides a color adjustment method for a display device, which adjusts the hue, saturation or brightness of each pixel group according to the hue and saturation of each pixel group to enhance the color sharpness of the picture.

The invention provides a display device comprising a video signal receiver, a zoom engine, a color engine, an output stage and a panel. The video signal receiver is used to receive video signals. The zoom engine is coupled to the video signal receiver for Adjust the resolution of the video signal. The color engine is coupled to the scaling engine and receives the video signal. The color engine includes a local adjustment unit, and the local adjustment unit is configured to adjust the first picture for the first pixel group having a specific range of tones in the picture of the video signal. The hue, saturation or brightness of the prime group. The output stage is coupled to the color engine for outputting the adjusted video signal. The panel is coupled to the output stage for presenting the adjusted video signal.

In an embodiment of the present invention, the local adjustment unit adjusts the hue and saturation of the second pixel group for the second pixel group having a specific range of hue and saturation of a specific range in the picture of the video signal. Or brightness.

The invention further provides a display device comprising a color engine, an output stage and a panel. The color engine is used to receive video signals. The color engine includes a tone statistics unit, which is used to count the number of pixels of each pixel group of the image of the video signal, wherein each pixel group has a specific range of colors, and the color engine is based on the painting of each pixel group. The amount of video is adjusted. The output stage is coupled to the color engine for outputting the adjusted video signal. The panel is coupled to the output stage for presenting the adjusted video signal.

In an embodiment of the present invention, the color engine further includes a local adjustment unit configured to adjust the hue, saturation, or saturation of the first pixel group for the first pixel group having a specific range of tones of the picture. brightness.

The present invention provides a method of displaying a video signal, including the following steps. Receiving a video signal, wherein the video signal is a digital signal. Adjust the resolution of the video signal. Adjusting the hue, saturation, or brightness of the first pixel group of the picture of the video signal, wherein the first pixel group has a specific range of hue. Presenting the adjusted video signal.

In an embodiment of the invention, the method for displaying a video signal further includes adjusting a hue, a saturation, or a brightness of a second pixel group, wherein the second pixel group has a hue of a specific range and a saturation of a specific range.

The invention further provides a method for displaying a video signal, comprising the following steps. Receiving a video signal, wherein the video signal is a digital signal. The number of pixels of each pixel group of the video signal is counted, wherein each pixel group has a specific range of tones. The video signal is adjusted according to the number of pixels of each pixel group. Presenting the adjusted video signal.

In an embodiment of the invention, the method for displaying a video signal further includes adjusting a hue, a saturation, or a brightness of the first pixel group for a first pixel group having a specific range of tones.

The invention further provides a color adjustment method for a display device, comprising the following steps. Multiple pixels are divided into corresponding tonal regions according to their hue and saturation. The distribution position of the pixels in each tonal region is adjusted by the conversion function.

In an embodiment of the invention, the color adjustment method of the display device further includes the following steps. Count the number of pixels in each tonal region. The conversion function is generated based on the number of pixels in each tonal region.

The present invention improves the picture quality by adjusting the hue, saturation, or brightness of each pixel group for each pixel group having a specific range of color tones.

The above described features and advantages of the present invention will be more apparent from the following description.

1 is a block diagram of a display device in accordance with a first embodiment of the present invention. Please refer to FIG. The display device includes a video signal receiver 10, a Scaling Engine 20, a Color Engine 30, an Output Stage 40, and a Panel 50. The video signal receiver 10 is configured to receive a video signal. In this embodiment, the video signal receiver 10 is exemplified by an analog digital converter (ADC). An analog digital converter is used to convert an analog video signal into a digital video signal. In other embodiments, the video signal receiver 10 can also be a digital video interface (DVI) for receiving digital video signals and outputting digital signals. The scaling engine 20 is coupled to the video signal receiver 10 for receiving digital video signals and adjusting the resolution of the video signals. For example, the video signal of 1280×1024 resolution is converted into a video signal of 1024×768 resolution. Those with ordinary knowledge in the field can convert the resolution of the video signal into the required resolution according to their needs, and will not be described here.

In the above, the color engine 30 is coupled to the scaling engine 20 and receives the video signal. It is worth noting that the color engine 30 includes a local adjustment unit 101. The local adjustment unit 101 is configured to adjust the hue, saturation or brightness of the first pixel group for the first pixel group having a specific range of tones in one of the video signals. The output stage 40 is coupled to the color engine 30 for increasing the driving capability of the video signal and outputting the video signal. The panel 50 is coupled to the output stage 40 for presenting the adjusted video signal. All of them are explained in more detail on how the color engine 30 adjusts the video data.

2-1 is a schematic diagram showing the hue and color saturation (color saturation) of each pixel of a picture according to the first embodiment of the present invention. Please refer to FIG. 2-1. It is assumed that the picture 201 is a picture of the video signal. In this embodiment, the resolution of the screen 201 is explained by taking the resolution of 3 × 3 as an example to explain the present embodiment. It should be understood by those skilled in the art that the "3 x 3 resolution" exemplified in this embodiment is only a specific embodiment. In another embodiment, the screen 201 can still have various resolutions. The invention should not be limited to this particular embodiment.

The picture 201 includes pixels P1 to P9, wherein the pixels P1 to P9 each have their hue, saturation and brightness. In order to facilitate the description of the embodiment, it is assumed here that the luminances of the pixels P1 to P9 are respectively luminance 1 to luminance 9, and the hue and saturation of the pixels P1 to P9 are represented by the color distribution map F101. In the color distribution map F101, the hue of the pixels is expressed by angle, assuming that red, green, and blue are angles of 0°, 120°, and 240°, respectively, and colors of 0° to 120° can be mixed with red and green. The color of 120 ° ~ 240 ° can be mixed with green and blue, 240 ° ~ 360 ° color can be mixed with blue and red, 360 ° and 0 ° are red. In the color distribution map F101, the saturation of the pixel is expressed by the distance from the center of the circle. That is to say, if the pixel falls at the center of the circle, the saturation of the pixel is 0. The farther away from the center of the circle, the greater the saturation.

In the above, the local adjustment unit 101 is configured to adjust the hue, saturation or brightness of the first pixel group for the first pixel group having a specific range of tones in one of the video signals. It is assumed that the first pixel group is a pixel group that falls in the area A1, that is, the local adjustment unit 101 of the color engine 30 is directed to The picture 201 has pixels of 0 to 30 degrees (i.e., pixels P1 to P3), and adjusts the hue, saturation, or brightness.

For example, the color engine 30 can be divided into a plurality of tonal regions according to the hue according to the HSI color space, and the plurality of pixels of the picture of the video signal are divided into a plurality of pixel groups according to the distribution of the tonal regions, wherein H represents a hue and S represents a saturation. Degree, I represents the brightness, and moves the area occupied by the pixel of the specific pixel group in the plurality of pixel groups to the HSI color space without changing the plurality of color axes of the HSI color space. Another area to adjust the hue of a particular pixel group in a pixel group having a hue within a predetermined range to locally adjust the hue of a pixel of a particular pixel group in the HIS color space without moving the picture Any other pixel group in the HIS color space other than a specific pixel group, wherein the above-mentioned preset range is a part of the global tone. Several embodiments will be further described below to illustrate the application of adjustment of hue, saturation, and brightness.

2-2 is a schematic diagram of adjusting the hue of a pixel falling in the area A1 according to the first embodiment of the present invention, please refer to FIG. 2-2. First, the local adjustment unit 101 adjusts the color tone of the pixel falling in the area A1 as an example. The local adjustment unit 101 reduces the hue of the pixels P1 to P3 by 30. Then, the hue and saturation of the pixels P1 to P3 are converted from the color distribution map F101 to the color distribution map F102. The saturation and brightness of the pixels P1~P3 remain unchanged, and only the hue changes from reddish to purpleish. Moreover, the hue, saturation and brightness of the pixels P4~P9 remain unchanged. The advantage of this approach is that for a first pixel group having a specific range of tones, the local adjustment unit 101 adjusts the hue of the first pixel group and maintains the hue, saturation, and brightness of other pixels. degree. In addition, it is worth mentioning that the color of the pixels is adjusted in the manner of Figure 2-2. If the angle of adjustment is too large, the color of the picture is not continuous. Therefore, in order to adjust the color tone of a pixel group having a specific range of color tones, it is preferable to adjust the small angle.

2-3 is a schematic diagram of adjusting the saturation of pixels falling in the area A1 according to the first embodiment of the present invention, please refer to FIG. 2-3. The local adjustment unit 101 adjusts the saturation of the pixels falling in the area A1 as an example. The local adjustment unit 101 increases the saturation of the pixels P1 to P3, and the hue and saturation of the pixels P1 to P3 are converted from the color distribution map F101 to the color distribution map F103. The hue and brightness of the pixels P1 to P3 remain unchanged, and only the saturation becomes large. Moreover, the hue, saturation and brightness of the pixels P4~P9 remain unchanged. The advantage of this approach is that for a first pixel group having a particular range of tones, the local adjustment unit 101 adjusts the saturation of the first pixel group and maintains the hue, saturation and brightness of the other pixels.

2-4 are schematic diagrams showing the adjustment of the brightness of pixels falling in the area A1 in accordance with the first embodiment of the present invention, please refer to Figs. 2-4. The local adjustment unit 101 adjusts the brightness of the pixels falling in the area A1 as an example. The local adjustment unit 101 increases the luminance of the pixels P1 to P3 by 5, and the luminances of the pixels P1 to P3 are converted from the luminances 1, 2, and 3 to the luminances 6, 7, and 8, respectively. The hue and saturation of the pixels P1 to P3 remain unchanged (i.e., from the color distribution map F101 to the color distribution map F104, wherein the color distribution map F101 is the same as the color distribution map F104), only the brightness changes. Moreover, the hue, saturation and brightness of the pixels P4~P9 remain unchanged. The advantage of this approach is that for the first pixel group with a specific range of tones, the local adjustment unit 101 The brightness of the first pixel group is adjusted, and the hue, saturation, and brightness of other pixels are maintained.

Those skilled in the art can also adapt their embodiments to the needs thereof, and the embodiments are modified in accordance with the spirit of the present invention and the teachings of the foregoing embodiments. For example, the local adjustment unit 101 of the color engine 30 adjusts the hue, saturation, or brightness of the second pixel group for the second pixel group having a specific range of hue and having a certain range of saturation in the picture of the video signal. It is assumed that the second pixel group is a pixel group that falls in the area A2, that is, the local adjustment unit 101 of the color engine 30 performs hue and saturation for the pixels of the picture 201 falling in the area A2 (ie, pixels P2 and P3). Degree or brightness adjustment.

2-5 are schematic views showing the adjustment of the hue of pixels falling in the area A2 in accordance with the second embodiment of the present invention, please refer to Figs. 2-5. For example, in the embodiment, the specific pixel group is further limited to a preset range of color saturation, and the pre-adjustment unit 101 adjusts the color of the pixel falling in the area A2. Set the range to be part of the global color saturation. The local adjustment unit 101 reduces the hue of the pixels P2 and P3 by 90°, and then the hue and saturation of the pixels P2 and P3 are converted from the color distribution map F101 to the color distribution map F105. The saturation and brightness of the pixels P2 and P3 remain unchanged, and only the hue changes from reddish to purple. Moreover, the hue, saturation and brightness of the pixels P4~P9 remain unchanged. The advantage of this approach is that for a second pixel group having a specific range of tones and a certain range of saturation, the local adjustment unit 101 adjusts the hue of the second pixel group and maintains the hue, saturation and brightness of other pixels. .

2-6 are adjustments in the area according to the second embodiment of the present invention For a schematic diagram of the saturation of the A2 pixel, please refer to Figure 2-6. The local adjustment unit 101 adjusts the saturation of the pixels falling in the area A2 as an example. The local adjustment unit 101 increases the saturation of the pixels P2 and P3, and the hue and saturation of the pixels P2 and P3 are converted from the color distribution map F101 to the color distribution map F106. The hue and brightness of the pixels P2 and P3 remain unchanged, and only the saturation becomes large. Moreover, the hue, saturation and brightness of the pixels P4~P9 remain unchanged. The advantage of this approach is that for a second pixel group having a specific range of tones and a certain range of saturation, the local adjustment unit 101 adjusts the saturation of the second pixel group and maintains the hue, saturation, and saturation of other pixels. brightness.

2-7 are schematic diagrams showing the adjustment of the brightness of pixels falling in the area A2 according to the second embodiment of the present invention, please refer to FIG. 2-7. The local adjustment unit 101 adjusts the brightness of the pixels falling in the area A2 as an example. The local adjustment unit 101 increases the luminance of the pixels P2 and P3 by 5, and the luminances of the pixels P2 and P3 are converted from the luminances 2 and 3 to the luminances 7 and 8, respectively. The hue and saturation of the pixels P2 and P3 remain unchanged (i.e., from the color distribution map F101 to the color distribution map F107, wherein the color distribution map F101 is the same as the color distribution map F107), only the brightness changes. Moreover, the hue, saturation and brightness of the pixels P4~P9 remain unchanged. The advantage of this approach is that for a second pixel group having a specific range of tones and a certain range of saturation, the local adjustment unit 101 adjusts the brightness of the second pixel group and maintains the hue, saturation and brightness of other pixels. .

Those skilled in the art can also adapt the needs of the present invention to the architecture of the display device in accordance with the teachings of the present invention and the teachings of the foregoing embodiments. For example, FIG. 3 is a block diagram of a display device in accordance with a third embodiment of the present invention. Please refer to FIG. 3. In this embodiment, the display device includes a video signal receiver 10, a zoom engine 20, a color engine 30, an output stage 40, a panel 50, a flash memory 60, and a microcontroller (Micro Controller, MCU for short). ) 70. The video signal receiver 10, the zoom engine 20, the color engine 30, the output stage 40, and the panel 50 are the same as those in the above embodiments, and are not described herein again. Of note is flash memory 60 and microcontroller 70. The microcontroller 70 is responsible for the various operations and controls of the display device. The flash memory 60 is coupled to the color engine 30. The flash memory 60 can store the color adjustment code in advance. Therefore, the color engine 30 can adjust the hue, saturation or brightness of the received video signal according to the color adjustment code stored in the flash memory 60.

Those skilled in the art can also view their needs, and in accordance with the spirit of the present invention and the teachings of the foregoing embodiments, a Hue Histogram Unit, a Pre-define Color, is added to the color engine 30. Management Table), Global Hue Unit, Global Saturation Unit, Global Intensity Unit, Luminance Histogram Unit, or Luminance Gamma Curve Unit), and adjust the coupling relationship with each other as appropriate. For example, FIG. 4 is a block diagram of a color engine according to a fourth embodiment of the present invention. Please refer to FIG. 4. The color engine 30 includes a local adjustment unit 101, a tone statistics unit 401, a predefined color management table 402, a global tone unit 403, a global saturation unit 404, and a global luminance unit. 405. Brightness statistics unit 406 and luminance gamma curve unit 407. The local adjustment unit 101 is the same as the above embodiment, and details are not described herein.

In the above, the tone statistic unit 401 is configured to count the number of pixels of each pixel group of the picture, wherein each pixel group has a color of a specific range. 5-1 is a schematic diagram of a color gradation according to a fourth embodiment of the present invention. Please refer to FIG. 5-1. In the present embodiment, the color tone of 30° is used as the division between the hue regions. In other embodiments, the hue of different angles can be used as the division between the hue regions. The color distribution map F101 becomes a color distribution map F108 after the color tone statistics. In the color distribution map F108, the number of pixels with a hue of 0° to 30° is three in total, and is indicated outside the circumference of the hue of 0° to 30°. And so on, the color tone 30 ° ~ 60 °, 60 ° ~ 90 °, 90 ° ~ 120 °, 120 ° ~ 150 °, 150 ° ~ 180 °, 180 ° ~ 210 °, 210 ° ~ 240 °, 240 ° ~ The number of pixels of 270°, 270°~300°, 300°~330°, and 330°~360° are 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, and 0, respectively. This method has the advantage that the tone distribution unit 401 can be used to know the tone distribution of each pixel in the picture. That is to say, the hue statistics unit 401 can infer what kind of picture the picture is. For example, if the number of statistical pixels is mostly blue, the picture may be sky. For example, if the number of pixels in the statistics is mostly skin color, the picture may be a portrait.

In the above, the predefined color management table 402 determines a color management table according to the number of pixels of each pixel group counted by the color statistic unit 401, and the color engine 30 adjusts the video signal according to the color management table. For example, the number of pixels in the statistics knows that the picture may be the sky, and the predefined color management table 402 generates a color management table for blue enhancement of each pixel, so that the blue sky can be More blue. For example, it is known by the number of statistical pixels that the picture may be a portrait, and the predefined color management table 402 generates a color management table for color enhancement of the color of each pixel, so that the skin color of the portrait is more white.

The global tone unit 403 is used to adjust the hue of each pixel of the overall picture. FIG. 5-2 is a schematic diagram of adjusting the global tone according to the fourth embodiment of the present invention, please refer to FIG. 5-2. In the present embodiment, the color tone of each pixel is increased by 30° by the global tone unit 403. In other embodiments, various color angles may be increased or decreased according to requirements. Each of the pixels of the color distribution map F101 is adjusted by the global tone unit 403 to become the color distribution map F109. The advantage of this method is that the color of each pixel can be adjusted together with the overall picture, and the saturation and brightness of each pixel are maintained, which greatly reduces the computational complexity.

The global saturation unit 404 is used to adjust the saturation of each pixel of the overall picture. FIG. 5-3 is a schematic diagram of adjusting global saturation according to a fourth embodiment of the present invention, please refer to FIG. 5-3. In the present embodiment, the saturation of each pixel is increased by the global saturation unit 404 as an example. In other embodiments, different degrees of saturation may be increased or decreased according to requirements. The pixels of the color distribution map F101 are adjusted by the global saturation unit 404 to become the color distribution map F110. The advantage of this method is that the saturation of each pixel can be adjusted together with the overall picture, and the hue and brightness of each pixel are maintained, which greatly reduces the computational complexity.

The global luminance unit 405 is configured to adjust the brightness of each pixel of the overall picture. FIG. 5-4 is a schematic diagram of adjusting the global brightness according to the fourth embodiment of the present invention. Please refer to FIG. 5-4. In this embodiment, the global brightness The unit 405 increases the luminance value 3 of each pixel as an example. In other embodiments, different degrees of brightness may be increased or decreased according to requirements. It is assumed that the luminances of the pixels P1 to P9 of FIG. 2B are respectively luminances 1 to 9. The pixels P1 to P9 of the color distribution map F101 are adjusted by the global luminance unit 405, and the luminances of the pixels P1 to P9 are respectively changed to brightness 4 to 12, and the hue and saturation of the pixels P1 to P9 remain unchanged (such as color). Distribution map F111). The advantage of this method is that the brightness of each pixel can be adjusted together with the overall picture, and the hue and saturation of each pixel are maintained, which greatly reduces the computational complexity.

The brightness statistics unit 406 is configured to count the number of pixels of each pixel group of the picture, wherein each pixel group has a specific range of brightness. 5-5 are schematic diagrams showing luminance statistics according to a fourth embodiment of the present invention. Please refer to FIG. 5-5. In the present embodiment, the luminance statistics unit 406 counts the number of pixels of each pixel (pixels P1 to P9) of the color distribution map F101 according to the brightness, and assumes that the luminances of the pixels P1 to P9 are respectively brightness 1 to 9. Then, the color distribution map F101 becomes the figure 5-5 after the brightness statistics. In Figure 5-5, the number of pixels with brightness 1 to brightness 9 is one. The advantage of this approach is that the luminance statistics unit 406 can be used to know the luminance distribution of each pixel in the picture. That is to say, the brightness statistics unit 406 can infer that the picture is a bright picture or a dark picture. For example, if the picture is a bright picture, the picture can be dimmed. For example, if the screen is a dark screen, the screen can be brightened.

The knowledge of the person skilled in the art can also adjust the contrast of the picture according to the brightness distribution of each pixel in the picture. For example, FIG. 6 is a schematic diagram of a luminance gamma curve according to a fourth embodiment of the present invention. Please refer to FIG. 6. Brightness gamma curve The element 407 is coupled to the brightness statistics unit 406. The luminance gamma curve unit 407 determines the luminance gamma curve according to the luminance distribution of each pixel counted by the luminance statistical unit 406. Those of ordinary skill in the art will appreciate that the luminance gamma curve of Figure 6 is only a particular embodiment, and in other embodiments, its suitable luminance gamma curve may be determined by its needs. The color engine 30 adjusts the video signal according to the brightness gamma curve. The brightness of each pixel is converted to a new brightness by the luminance gamma curve to enhance the contrast of the picture. In another embodiment, a person having ordinary knowledge in the art can preset a plurality of sets of luminance gamma curves, and the luminance gamma curve unit 407 selects the luminance distribution of each pixel according to the luminance statistical unit 406. Suitable for the brightness of the gamma curve.

Those skilled in the art can also adapt the needs of the present invention to the architecture of the display device in accordance with the teachings of the present invention and the teachings of the foregoing embodiments. For example, FIG. 7 is a block diagram of a display device according to a fifth embodiment of the present invention. Please refer to FIG. 7. In the present embodiment, the display device includes a color engine 31, an output stage 40, and a panel 50. The color engine 31 is configured to receive video signals. The color engine 31 includes a tone statistic unit 401. The color tone statistics unit 41 is configured to count the number of pixels of each pixel group of the picture of the video signal, wherein each pixel group has a specific range of color tones, and the color engine 31 adjusts the video signal according to the number of pixels of each pixel group. The video signal can also be adjusted according to the statistics of the pixels of each pixel group in the HSI color space. The output stage 40 is coupled to the color engine 31 for outputting video signals. The panel 50 is coupled to the output stage 40 for presenting the adjusted video signal. For the function of the color tone statistics unit 401, the output stage 40 and the panel 50, please refer to The above embodiments are not described herein again.

Those skilled in the art can also adapt the needs of the present invention to the architecture of the display device in accordance with the teachings of the present invention and the teachings of the foregoing embodiments. For example, FIG. 8 is a block diagram of a display device according to a sixth embodiment of the present invention. Please refer to FIG. 8. In the embodiment, the display device includes a color engine 31, an output stage 40, a panel 50, a flash memory 60, and a microcontroller 70. For the functions of the color engine 31, the output stage 40, the panel 50, the flash memory 60 and the microcontroller 70, please refer to the above embodiments, and details are not described herein.

Those skilled in the art can also view their needs, and in accordance with the spirit of the present invention and the teachings of the foregoing embodiments, a local adjustment unit, a predefined color management table, a global tone unit, a global saturation unit, The global luminance unit, the luminance statistical unit, or the luminance gamma curve unit, and the coupling relationship between them is appropriately adjusted. For example, FIG. 9 is a block diagram of a color engine according to a seventh embodiment of the present invention. Please refer to FIG. 9. The color engine 31 includes a local adjustment unit 101, a tone statistic unit 401, a predefined color management table 402, a global tone unit 403, a global saturation unit 404, a global luminance unit 405, a luminance statistics unit 406, and a luminance gamma curve unit 407. The local adjustment unit 101, the tone statistic unit 401, the predefined color management table 402, the global tone unit 403, the global saturation unit 404, the global luminance unit 405, the luminance statistics unit 406, and the luminance gamma curve unit 407 can refer to the foregoing implementations. For example, it will not be repeated here.

Figure 10-1 is a display device in accordance with an eighth embodiment of the present invention For a flowchart of the color adjustment method, please refer to Figure 10-1. First, step S101 is executed. The color engine in the above embodiment divides the plurality of pixels in the picture into corresponding plurality of tonal regions according to their hue and saturation. The HSI color space can be divided into a plurality of tonal regions according to the hue, and the plurality of pixels of the video signal are divided into a plurality of pixel groups according to the distribution of the tonal regions, wherein H represents a hue and S represents a saturation. I stands for brightness. Then, in step S102, the color engine moves the plurality of pixels of the hue region from one region occupied by the HSI color space to another region without changing the plurality of color axes of the HSI color space. The distribution locations of the pixels within one of the plurality of tonal regions are adjusted by a conversion function, wherein the plurality of tonal regions are individually adjustable without moving the tonal regions in any other HSI color space.

The above embodiment, for example, FIG. 10-2 is a color adjustment diagram of FIG. 10-1 according to the present invention. Please refer to FIG. 10-2. The picture 201 includes pixels P1 to P9. The screen 201 is changed to the color distribution map F101 after the step S101. The color distribution map F101 becomes the color distribution map F112 after the step S102. It is to be noted that the regions A3 and A4 in the color distribution map F101 are converted into regions A5 and A6 in the color distribution map F112 after being converted by the conversion function. The pixels P1~P4 also move to different positions as the area changes. In other words, the pixels P1 to P4 also change their hue after being converted by the conversion function. The advantage of this method is that the conversion function can be used to convert the pixel position of each region to smoothly adjust the color of the pixels, so as to avoid the phenomenon that the pixels in the converted picture produce a discontinuity of the color. Those with ordinary knowledge in the field can also use the internal difference method to adjust the pixels according to their needs. Hue, no longer repeat here.

According to the above embodiment, and FIG. 10-3 is another schematic diagram of color adjustment shown in FIG. 10-1 according to the present invention, please refer to FIG. 10-3. The picture 201 includes pixels P1 to P9. The screen 201 is changed to the color distribution map F101 after the step S101. On the other hand, the color distribution map F101 changes to the color distribution map F113 after the step S102. It is to be noted that the areas A7 and A8 in the color distribution map F101 are converted into the areas A9 and A10 in the color distribution map F113 after being converted by the conversion function. The pixels P2 and P3 also move to different positions as the area changes. In other words, the pixels P2 and P3 also change their saturation after being converted by the conversion function. The advantage of this method is that the conversion of the pixel position of each region by the conversion function can smoothly adjust the saturation of the pixel, and avoid the phenomenon that the pixel after the conversion is generated and the saturation of the pixel is discontinuous. Those with ordinary knowledge in the field can also use the internal difference method to adjust the saturation of pixels according to their needs, and will not be described here.

In some embodiments, for example, the hue of a particular pixel group in the plurality of pixel groups may be adjusted without changing the plurality of color axes of the HSI color space to locally adjust the HIS color space. A hue of a pixel of a particular pixel group without moving any other pixel group other than the particular pixel group, wherein the particular pixel group has a hue within a predetermined range, the preset range being a portion of the global hue.

Those skilled in the art can also view their needs, and according to the spirit of the present invention and the teachings of the foregoing embodiments, the distribution function, the distribution shape and the distribution position of each region are simultaneously adjusted by a conversion function, in other words, each can be simultaneously converted according to the needs thereof. The hue and saturation of the pixels are not described here.

The manner in which the person skilled in the art can also understand the needs of the present invention can be modified in accordance with the spirit of the present invention and the foregoing embodiments. For example, the color statistic unit is used to count the number of pixels in each tone region, and the color engine generates a conversion function according to the number of pixels in each tone region, and the color engine adjusts the color of the video signal according to the conversion function. For example, the brightness statistics unit is used to count the number of pixels of each brightness, and the brightness gamma curve generates a brightness gamma curve according to the number of pixels of each brightness, and adjusts the brightness of the video signal according to the brightness gamma curve.

In summary, the embodiments of the present invention have at least the following advantages:

1. The local adjustment unit can adjust the hue, saturation or brightness of the first pixel group for the first pixel group having a specific range of hue in the picture of the video signal, while maintaining the hue and saturation of other pixels in the picture. Degree or brightness.

2. The local adjustment unit can adjust the hue, saturation or brightness of the second pixel group for the second pixel group having a specific range of hue and saturation of a specific range in the picture of the video signal while maintaining the picture The hue, saturation, or brightness of other pixels.

3. The tone statistic unit can be used to count the number of pixels of the plurality of pixel groups of the picture of the video signal, wherein each pixel group has a specific range of color to adjust the video signal.

4. The distribution size and distribution position of each area are simultaneously adjusted by the conversion function, thereby smoothly adjusting the pixel hue and saturation of the video signal.

Although the present invention has been disclosed above in the preferred embodiment, it is not intended to be used The scope of the present invention is defined by the scope of the appended claims, and the scope of the invention is defined by the scope of the appended claims. Subject to it.

10‧‧‧Video signal receiver

20‧‧‧Zoom engine

30, 31‧‧‧Color Engine

40‧‧‧Output level

50‧‧‧ panel

60‧‧‧Flash memory

70‧‧‧Microcontroller

101‧‧‧Local adjustment unit

201‧‧‧ screen

401‧‧‧tone statistical unit

402‧‧‧Predefined color management table

403‧‧‧Global tonal unit

404‧‧‧Global saturation unit

405‧‧‧Global brightness unit

406‧‧‧Brightness statistics unit

407‧‧‧Brightness gamma curve unit

F101~F113‧‧‧Color distribution map

P1~P9‧‧‧ pixels

A1~A10‧‧‧Area

S101~S102‧‧‧ steps of the flow chart of the color adjustment method according to the embodiment of the invention

1 is a block diagram of a display device in accordance with a first embodiment of the present invention.

Figure 2-1 is a diagram showing the hue and color saturation (color saturation) of each pixel of a picture according to the first embodiment of the present invention.

2-2 is a diagram showing the adjustment of the hue of the pixels falling in the area A1 in accordance with the first embodiment of the present invention.

2-3 is a diagram showing the adjustment of the saturation of pixels falling in the area A1 in accordance with the first embodiment of the present invention.

2-4 are diagrams showing the adjustment of the brightness of a pixel falling in the area A1 in accordance with the first embodiment of the present invention.

2-5 are schematic views showing the adjustment of the hue of pixels falling in the area A2 in accordance with the second embodiment of the present invention.

2-6 are schematic views showing the adjustment of the saturation of pixels falling in the area A2 in accordance with the second embodiment of the present invention.

2-7 are schematic views showing the adjustment of the brightness of pixels falling in the area A2 in accordance with the second embodiment of the present invention.

3 is a block diagram of a display device in accordance with a third embodiment of the present invention.

4 is a block diagram of a color engine in accordance with a fourth embodiment of the present invention.

5-1 is a diagram showing a color gradation according to a fourth embodiment of the present invention.

Figure 5-2 is a schematic illustration of adjusting the global tones in accordance with a fourth embodiment of the present invention.

Figure 5-3 is a schematic diagram of adjusting global saturation in accordance with a fourth embodiment of the present invention.

Figure 5-4 is a diagram showing the adjustment of the global brightness according to the fourth embodiment of the present invention.

5-5 are schematic diagrams of luminance statistics in accordance with a fourth embodiment of the present invention.

Figure 6 is a schematic illustration of a luminance gamma curve in accordance with a fourth embodiment of the present invention.

Figure 7 is a block diagram of a display device in accordance with a fifth embodiment of the present invention.

Figure 8 is a block diagram of a display device in accordance with a sixth embodiment of the present invention.

9 is a block diagram of a color engine in accordance with a seventh embodiment of the present invention.

10-1 is a flow chart of a color adjustment method of a display device in accordance with an eighth embodiment of the present invention.

Figure 10-2 is a color adjustment diagram of Figure 10-1 in accordance with the present invention.

Figure 10-3 is a schematic diagram of another color adjustment illustrated in Figure 10-1 in accordance with the present invention.

201‧‧‧ screen

P1~P9‧‧‧ pixels

F101, F112‧‧‧ color distribution map

Claims (17)

A display device includes: a video signal receiver for receiving a video signal; a color engine, which is divided into a plurality of tonal regions according to a hue of the HSI color space, and a plurality of pixels of a picture of the video signal are associated with each other The distribution of the tonal regions is divided into a plurality of pixel groups, wherein H represents a hue, S represents saturation, and I represents luminance, and without changing the plurality of color axes of the HSI color space, The pixels of a particular pixel group in the pixel group move to one of the areas occupied by the HSI color space to adjust the specific pixel in the pixel group having a color tone within a preset range. The hue of the group to locally adjust the hue of the pixel of the particular pixel group in the HIS color space without moving any other pixel group of the picture other than the particular pixel group in the HIS color space, wherein The preset range is a part of the global tone; and an output stage coupled to the color engine for outputting the adjusted video signal. The display device of claim 1, wherein the adjusted pixel group is further limited to a color saturation within a predetermined range, wherein the preset range is a part of global color saturation. The display device of claim 1, wherein the color engine further counts the number of pixels of the pixel groups of the picture of the video signal according to each pixel group in the HSI color space. The number of pixels is adjusted to adjust the video signal. The display device according to claim 3, wherein the color The color engine further determines a color management table according to the number of pixels of the one or more pixel groups to adjust the video signal according to the color management table. The display device of claim 1, wherein the color engine further adjusts at least one of a global hue, a global saturation, and a global brightness of the picture. The display device of claim 3, wherein the color engine further determines a brightness gamma curve according to the number of pixels of the one or more pixel groups to adjust the video signal according to the brightness gamma curve. A method for displaying a video signal includes the steps of: receiving a video signal; and dividing the color tone of the HSI color space into a plurality of tonal regions, wherein the plurality of pixels of the picture of the video signal are distributed according to the distribution of the tonal regions Divided into a plurality of pixel groups, wherein H represents a hue, S represents saturation, I represents brightness; and adjusts a specific pixel in the pixel groups without changing a plurality of color axes of the HSI color space. The hue of the group to locally adjust the hue of the particular pixel group in the HIS color space without moving any other pixel group other than the particular pixel group, wherein the particular pixel group has a predetermined range The inner tones, which are part of the global tones. The method for displaying a video signal according to claim 7, wherein the adjusted pixel group is further limited to a color saturation within a preset range, wherein the preset range is global color saturation. portion. The party displaying the video signal as described in item 7 of the patent application scope The method further includes: counting the number of pixels of the pixel groups of the picture; and adjusting the video signal according to the statistical quantity of the pixels of the pixel group in the HIS color space. The method for displaying a video signal as described in claim 9 further includes determining a color management table according to the counted number of pixels of the one or more pixel groups to adjust the video according to the color management table. Signal. The method for displaying a video signal as described in claim 7 further includes adjusting at least one of a global tone, a global saturation, and a global luminance of the picture. The method for displaying a video signal as described in claim 9 further includes determining a brightness gamma curve according to the number of pixels of the one or more pixel groups, to adjust according to the brightness gamma curve. The video signal. A display device includes: a color engine for receiving a video signal and adjusting the video signal of a plurality of pixels of a picture in an HSI color space, the color engine being divided into a plurality of colors according to the hue of the HSI color space a hue region, where H represents a hue, S represents a saturation, and I represents a brightness. The pixels of the picture are divided into a plurality of pixel groups according to the distribution of the hue regions to which the pixels belong, and the color engine includes: a tone statistic unit for counting the number of pixels of the pixel group of the picture of the video signal to provide the color to the color engine, the color The color engine adjusts the video signal according to the number of pixels of the pixel group in the HSI color space, wherein each pixel group has a color tone within a preset range, and the preset range is a part of the global color tone; And an output stage coupled to the color engine for outputting the adjusted video signal. The display device of claim 13 further comprising a panel coupled to the output stage for presenting the adjusted video signal. A method for displaying a video signal includes the steps of: receiving a video signal, wherein the video signal is a digital signal; and determining a color tone according to a hue of an HSI color space, wherein H represents a hue, S represents a saturation, and I represents Brightness; a plurality of pixels of the picture of the video signal, the pixels are divided into a plurality of pixel groups according to the distribution of the tonal regions; and the number of pixels of each pixel group is counted, wherein each pixel The pixel group has a hue within a predetermined range as part of the hue regions; and the video signal is adjusted according to the number of pixels of the pixel group in the HSI color space. The method for displaying a video signal as described in claim 15 of the patent application further includes displaying the adjusted video signal. A color adjustment method for a display device, comprising the steps of: dividing a plurality of pixels of a video signal of a picture into a plurality of tonal regions distinguished by a hue in an HSI color space, wherein H represents a hue and S represents a saturation Degree, I represents brightness, and each of the tonal regions is a part of the global tone; The pixels of the hue region are moved from one region occupied by the HSI color space to another region without changing the plurality of color axes of the HSI color space to be adjusted by a conversion function. A distribution of the tones of the pixels within one of the tonal regions, wherein the tonal regions are individually adjusted without moving any other tonal regions in the HSI color space.